Từ điểm A cố định ngoài (O). Kẻ hai tiếp tuyến AB,AC (B,C là tiếp điểm). Đường thẳng bất kì qua A cắt (O) tại M,N (AM<AN). Tiếp tuyến tại M của (O) cắt AB,AC tại E,F. Dựng đường thẳng qua O song song BC cắt AB,AC tại P,Q. Tìm vị trí điểm M để:
a) EF đạt GTNN
b) Diện tích tam giác AEF đạt GTLN
Mọi người có thể làm tắt các bước đơn giản, chỉ cần cho mình hướng làm cụ thể ở hai phần là được, mong mọi người giúp đỡ!

6 tuổi

Tích nha. MÌnh sẽ tích lại

Cạnh bc = chu vi tam giác abc - ab - ac

123 + 123 .= 123 + 123 

300 + 120   <  1000

36 km ứng với : 1/4 + 1/5 = 9/20 ( quãng đường AB )

Quãng đường AB dài : 36 : 9/20 = 80 ( km )

1.READ THE PASSAGE AND MARK THE A, B, C, D TO INDICATE THE CORRECT ANSWER TO EACH OF THE QUESTIONS:
Discipline is an important virtue in one's life. Discipline means complete obedience to certain rules and regulations. Life without discipline is just like a house without a roof. It is absolutely essential for successful life.
Discipline is the structural and fundamental unit of a successful person. It is essential for us in home, for soldiers in battlefield, for students in school, for players in playground. A team of experienced players often lose the match because of indiscipline in the team. A horrible battle can be won by a disciplined army.
Discipline is very important in a student's life. He must obey his teachers, must abide by the rules of school. He should be sincere, dedicated, firm and focus his goals. If he violates, then he suffers a great deal in his future.
As a student is the future of our country, so, he needs to be very punctual to his routine, hard working, healthy and fit. Discipline demands self-control and dedication. It let to the formation of a good society and nation as well.
1. What is discipline?
A. obedience to rules and regulations B. house without roof
C. successful life D. rules and regulations
2. What does the word ''fundamental'' mean?
A. tiny B. trivial C. basic D. small
3. Discipline is
A. student's life B. our teacher C. decication D. very important
4. The word ''follow'' can best be replaced by
A. move B. obey C. remember D. forget
5. Discipline requires
A. a good society B. a good nation C. routine D. self-control and decication

2. COMBINE TWO SENTENCES INTO A NEW ONE
She has written many essays. This is the best one. (ever)
->
(Mình muốn kiểm tra xem đáp án của mình có giống mọi người không, mong mọi người giúp đỡ!)

33 x 1234 - 2345 + 12

= 40 722 - 2345 + 12

= 38 377 + 12

= 38 389